MARKETABLE SECURITIES - Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Less than one year	$ 28.5
One to five years	43.8
Six to ten years	35.6
Greater than ten years	93.7
Amortized Cost	201.6	$ 214.5
Fair Value
Less than one year	28.3
One to five years	42.4
Six to ten years	32.3
Greater than ten years	82.5
Total Debt Securities	$ 185.5	$ 219.4